The velocity ratio and efficiency of a system of pully is 6 and 80percent.how much effort is required to lift at Mass 120kg

(120 kg * g / 6) / .80

To find the effort required to lift a mass using a system of pulleys, we need to determine the mechanical advantage of the system and then use it to calculate the effort. The velocity ratio is the mechanical advantage of a pulley system.

The velocity ratio is given as 6, which means that for every 1 unit of effort applied, the load will move 6 units. The efficiency of the system is given as 80%, which means that 80% of the input work is converted into useful output work.

First, we calculate the mechanical advantage (MA) using the velocity ratio formula:

MA = velocity ratio = 6

Since the efficiency is also given, we can use the following formula to determine the actual mechanical advantage (AMA):

AMA = MA * efficiency

AMA = 6 * 0.80 = 4.8

Now, to calculate the effort required, we can use the formula:

Effort = Load / AMA

Given that the mass (load) is 120 kg, we substitute the values into the formula:

Effort = 120 kg / 4.8 = 25 kg

Therefore, an effort of 25 kg is required to lift a mass of 120 kg using the given pulley system.

To calculate the effort required to lift a mass using a system of pulleys, we need the velocity ratio and efficiency of the system. Let's break down the steps:

Step 1: Convert efficiency to its decimal form
The efficiency is given as 80 percent. To convert it to decimal form, divide the percentage by 100.
80% / 100 = 0.8

Step 2: Calculate the ideal mechanical advantage (IMA)
The ideal mechanical advantage is equal to the velocity ratio of the system.
Velocity Ratio = IMA
Therefore, the IMA in this case is 6.

Step 3: Calculate the actual mechanical advantage (AMA)
The actual mechanical advantage is equal to the IMA multiplied by the efficiency.
AMA = IMA * Efficiency
AMA = 6 * 0.8
AMA = 4.8

Step 4: Calculate the effort required
Effort = (Load) / (AMA)
Effort = 120 kg / 4.8
Effort = 25 kg

Therefore, the effort required to lift a mass of 120 kg using the given system of pulleys is 25 kg.